1 #ifndef _LINUX_HUGE_MM_H
2 #define _LINUX_HUGE_MM_H
4 extern int do_huge_pmd_anonymous_page(struct mm_struct
*mm
,
5 struct vm_area_struct
*vma
,
6 unsigned long address
, pmd_t
*pmd
,
8 extern int copy_huge_pmd(struct mm_struct
*dst_mm
, struct mm_struct
*src_mm
,
9 pmd_t
*dst_pmd
, pmd_t
*src_pmd
, unsigned long addr
,
10 struct vm_area_struct
*vma
);
11 extern int do_huge_pmd_wp_page(struct mm_struct
*mm
, struct vm_area_struct
*vma
,
12 unsigned long address
, pmd_t
*pmd
,
14 extern struct page
*follow_trans_huge_pmd(struct mm_struct
*mm
,
18 extern int zap_huge_pmd(struct mmu_gather
*tlb
,
19 struct vm_area_struct
*vma
,
20 pmd_t
*pmd
, unsigned long addr
);
21 extern int mincore_huge_pmd(struct vm_area_struct
*vma
, pmd_t
*pmd
,
22 unsigned long addr
, unsigned long end
,
24 extern int move_huge_pmd(struct vm_area_struct
*vma
,
25 struct vm_area_struct
*new_vma
,
26 unsigned long old_addr
,
27 unsigned long new_addr
, unsigned long old_end
,
28 pmd_t
*old_pmd
, pmd_t
*new_pmd
);
29 extern int change_huge_pmd(struct vm_area_struct
*vma
, pmd_t
*pmd
,
30 unsigned long addr
, pgprot_t newprot
);
32 enum transparent_hugepage_flag
{
33 TRANSPARENT_HUGEPAGE_FLAG
,
34 TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG
,
35 TRANSPARENT_HUGEPAGE_DEFRAG_FLAG
,
36 TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG
,
37 TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG
,
38 #ifdef CONFIG_DEBUG_VM
39 TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG
,
43 enum page_check_address_pmd_flag
{
44 PAGE_CHECK_ADDRESS_PMD_FLAG
,
45 PAGE_CHECK_ADDRESS_PMD_NOTSPLITTING_FLAG
,
46 PAGE_CHECK_ADDRESS_PMD_SPLITTING_FLAG
,
48 extern pmd_t
*page_check_address_pmd(struct page
*page
,
50 unsigned long address
,
51 enum page_check_address_pmd_flag flag
);
53 #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
54 #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
56 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
57 #define HPAGE_PMD_SHIFT HPAGE_SHIFT
58 #define HPAGE_PMD_MASK HPAGE_MASK
59 #define HPAGE_PMD_SIZE HPAGE_SIZE
61 extern bool is_vma_temporary_stack(struct vm_area_struct
*vma
);
63 #define transparent_hugepage_enabled(__vma) \
64 ((transparent_hugepage_flags & \
65 (1<<TRANSPARENT_HUGEPAGE_FLAG) || \
66 (transparent_hugepage_flags & \
67 (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \
68 ((__vma)->vm_flags & VM_HUGEPAGE))) && \
69 !((__vma)->vm_flags & VM_NOHUGEPAGE) && \
70 !is_vma_temporary_stack(__vma))
71 #define transparent_hugepage_defrag(__vma) \
72 ((transparent_hugepage_flags & \
73 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) || \
74 (transparent_hugepage_flags & \
75 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG) && \
76 (__vma)->vm_flags & VM_HUGEPAGE))
77 #ifdef CONFIG_DEBUG_VM
78 #define transparent_hugepage_debug_cow() \
79 (transparent_hugepage_flags & \
80 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
81 #else /* CONFIG_DEBUG_VM */
82 #define transparent_hugepage_debug_cow() 0
83 #endif /* CONFIG_DEBUG_VM */
85 extern unsigned long transparent_hugepage_flags
;
86 extern int copy_pte_range(struct mm_struct
*dst_mm
, struct mm_struct
*src_mm
,
87 pmd_t
*dst_pmd
, pmd_t
*src_pmd
,
88 struct vm_area_struct
*vma
,
89 unsigned long addr
, unsigned long end
);
90 extern int handle_pte_fault(struct mm_struct
*mm
,
91 struct vm_area_struct
*vma
, unsigned long address
,
92 pte_t
*pte
, pmd_t
*pmd
, unsigned int flags
);
93 extern int split_huge_page(struct page
*page
);
94 extern void __split_huge_page_pmd(struct mm_struct
*mm
, pmd_t
*pmd
);
95 #define split_huge_page_pmd(__mm, __pmd) \
97 pmd_t *____pmd = (__pmd); \
98 if (unlikely(pmd_trans_huge(*____pmd))) \
99 __split_huge_page_pmd(__mm, ____pmd); \
101 #define wait_split_huge_page(__anon_vma, __pmd) \
103 pmd_t *____pmd = (__pmd); \
104 anon_vma_lock(__anon_vma); \
105 anon_vma_unlock(__anon_vma); \
106 BUG_ON(pmd_trans_splitting(*____pmd) || \
107 pmd_trans_huge(*____pmd)); \
109 #if HPAGE_PMD_ORDER > MAX_ORDER
110 #error "hugepages can't be allocated by the buddy allocator"
112 extern int hugepage_madvise(struct vm_area_struct
*vma
,
113 unsigned long *vm_flags
, int advice
);
114 extern void __vma_adjust_trans_huge(struct vm_area_struct
*vma
,
118 extern int __pmd_trans_huge_lock(pmd_t
*pmd
,
119 struct vm_area_struct
*vma
);
120 /* mmap_sem must be held on entry */
121 static inline int pmd_trans_huge_lock(pmd_t
*pmd
,
122 struct vm_area_struct
*vma
)
124 VM_BUG_ON(!rwsem_is_locked(&vma
->vm_mm
->mmap_sem
));
125 if (pmd_trans_huge(*pmd
))
126 return __pmd_trans_huge_lock(pmd
, vma
);
130 static inline void vma_adjust_trans_huge(struct vm_area_struct
*vma
,
135 if (!vma
->anon_vma
|| vma
->vm_ops
)
137 __vma_adjust_trans_huge(vma
, start
, end
, adjust_next
);
139 static inline int hpage_nr_pages(struct page
*page
)
141 if (unlikely(PageTransHuge(page
)))
145 static inline struct page
*compound_trans_head(struct page
*page
)
147 if (PageTail(page
)) {
149 head
= page
->first_page
;
152 * head may be a dangling pointer.
153 * __split_huge_page_refcount clears PageTail before
154 * overwriting first_page, so if PageTail is still
155 * there it means the head pointer isn't dangling.
162 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
163 #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
164 #define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
165 #define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
167 #define hpage_nr_pages(x) 1
169 #define transparent_hugepage_enabled(__vma) 0
171 #define transparent_hugepage_flags 0UL
172 static inline int split_huge_page(struct page
*page
)
176 #define split_huge_page_pmd(__mm, __pmd) \
178 #define wait_split_huge_page(__anon_vma, __pmd) \
180 #define compound_trans_head(page) compound_head(page)
181 static inline int hugepage_madvise(struct vm_area_struct
*vma
,
182 unsigned long *vm_flags
, int advice
)
187 static inline void vma_adjust_trans_huge(struct vm_area_struct
*vma
,
193 static inline int pmd_trans_huge_lock(pmd_t
*pmd
,
194 struct vm_area_struct
*vma
)
198 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
200 #endif /* _LINUX_HUGE_MM_H */